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<h3>
Ben Gamari pushed to branch wip/backports-9.0
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
</h3>
<h4>
Commits:
</h4>
<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f72f27a325c16bf2975ee2a8a49c439b46ee8498">f72f27a3</a></strong>
<div>
<span>by GHC GitLab CI</span>
<i>at 2020-11-30T19:21:56-05:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">ThreadPaused: Don't zero slop until free vars are pushed
When threadPaused blackholes a thunk it calls `OVERWRITING_CLOSURE` to
zero the slop for the benefit of the sanity checker. Previously this was
done *before* pushing the thunk's free variables to the update
remembered set. Consequently we would pull zero'd pointers to the update
remembered set.
(cherry picked from commit 3e75b0dbaca5fbd8abc529d70c1df159f5bfbaa4)
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<h4>2 changed files:</h4>
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<a href="#aa19e824b3a8c24a7bf37f8352997022b14a5a0c">
includes/rts/storage/ClosureMacros.h
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<a href="#4b22b3f666af23f7c8097b32282abfd52fb6c342">
rts/ThreadPaused.c
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<h4>Changes:</h4>
<li id="aa19e824b3a8c24a7bf37f8352997022b14a5a0c">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f72f27a325c16bf2975ee2a8a49c439b46ee8498#aa19e824b3a8c24a7bf37f8352997022b14a5a0c"><strong>includes/rts/storage/ClosureMacros.h</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -520,11 +520,15 @@ INLINE_HEADER StgWord8 *mutArrPtrsCard (StgMutArrPtrs *a, W_ n)</td>
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<pre style="margin: 0;"> <span id="LC520" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#if defined(PROFILING) || defined(DEBUG)</span></span>
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521
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<pre style="margin: 0;"> <span id="LC521" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#define OVERWRITING_CLOSURE(c) \</span></span>
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<pre style="margin: 0;"> <span id="LC522" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;"> overwritingClosure(c)</span></span>
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523
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<pre style="margin: 0;">+<span id="LC523" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#define OVERWRITING_CLOSURE_SIZE(c, size) \</span></span>
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<pre style="margin: 0;">+<span id="LC524" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;"> overwritingClosureSize(c, size)</span></span>
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<pre style="margin: 0;"> <span id="LC525" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#define OVERWRITING_CLOSURE_MUTABLE(c, off) \</span></span>
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<pre style="margin: 0;"> <span id="LC526" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;"> overwritingMutableClosureOfs(c, off)</span></span>
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<pre style="margin: 0;"> <span id="LC527" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#else</span></span>
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<pre style="margin: 0;"> <span id="LC528" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#define OVERWRITING_CLOSURE(c) \</span></span>
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527
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<pre style="margin: 0;"> <span id="LC529" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;"> do { (void) sizeof(c); } while(0)</span></span>
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<pre style="margin: 0;">+<span id="LC530" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#define OVERWRITING_CLOSURE_SIZE(c, size) \</span></span>
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<pre style="margin: 0;">+<span id="LC531" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;"> do { (void) sizeof(c); (void) sizeof(size); } while(0)</span></span>
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528
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<pre style="margin: 0;"> <span id="LC532" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#define OVERWRITING_CLOSURE_MUTABLE(c, off) \</span></span>
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<pre style="margin: 0;"> <span id="LC533" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;"> do { (void) sizeof(c); (void) sizeof(off); } while(0)</span></span>
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<pre style="margin: 0;"> <span id="LC534" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#endif</span></span>
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<li id="4b22b3f666af23f7c8097b32282abfd52fb6c342">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f72f27a325c16bf2975ee2a8a49c439b46ee8498#4b22b3f666af23f7c8097b32282abfd52fb6c342"><strong>rts/ThreadPaused.c</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="314" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="314" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -314,10 +314,6 @@ threadPaused(Capability *cap, StgTSO *tso)</td>
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<pre style="margin: 0;"> <span id="LC314" class="line" lang="c"> <span class="k" style="font-weight: 600;">continue</span><span class="p">;</span></span>
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<pre style="margin: 0;"> <span id="LC315" class="line" lang="c"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC316" class="line" lang="c"></span>
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<pre style="margin: 0;">-<span id="LC317" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// zero out the slop so that the sanity checker can tell</span></span>
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<pre style="margin: 0;">-<span id="LC318" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// where the next closure is.</span></span>
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<pre style="margin: 0;">-<span id="LC319" class="line" lang="c"> <span class="n" style="color: #333;">OVERWRITING_CLOSURE</span><span class="p">(</span><span class="n" style="color: #333;">bh</span><span class="p">);</span></span>
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<pre style="margin: 0;">-<span id="LC320" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC317" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// an EAGER_BLACKHOLE or CAF_BLACKHOLE gets turned into a</span></span>
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<pre style="margin: 0;"> <span id="LC318" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// BLACKHOLE here.</span></span>
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<pre style="margin: 0;"> <span id="LC319" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#if defined(THREADED_RTS)</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -345,11 +341,16 @@ threadPaused(Capability *cap, StgTSO *tso)</td>
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<pre style="margin: 0;"> <span id="LC341" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// overwrite to the update remembered set.</span></span>
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<pre style="margin: 0;"> <span id="LC342" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// N.B. We caught the WHITEHOLE case above.</span></span>
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<pre style="margin: 0;"> <span id="LC343" class="line" lang="c"> <span class="n" style="color: #333;">updateRemembSetPushThunkEager</span><span class="p">(</span><span class="n" style="color: #333;">cap</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC348" class="line" lang="c"> <span class="n" style="color: #333;">THUNK_INFO_PTR_TO_STRUCT</span><span class="p">(</span><span class="n" style="color: #333;">bh_info</span><span class="p">),</span></span>
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<pre style="margin: 0;">-<span id="LC349" class="line" lang="c"> <span class="p">(</span><span class="n" style="color: #333;">StgThunk</span> <span class="o" style="font-weight: 600;">*</span><span class="p">)</span> <span class="n" style="color: #333;">bh</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC344" class="line" lang="c"> <span class="idiff left right"> </span><span class="n" style="color: #333;">THUNK_INFO_PTR_TO_STRUCT</span><span class="p">(</span><span class="n" style="color: #333;">bh_info</span><span class="p">),</span></span>
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<pre style="margin: 0;">+<span id="LC345" class="line" lang="c"> <span class="idiff left right"> </span><span class="p">(</span><span class="n" style="color: #333;">StgThunk</span> <span class="o" style="font-weight: 600;">*</span><span class="p">)</span> <span class="n" style="color: #333;">bh</span><span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC346" class="line" lang="c"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC347" class="line" lang="c"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC348" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC349" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// zero out the slop so that the sanity checker can tell</span></span>
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<pre style="margin: 0;">+<span id="LC350" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// where the next closure is. N.B. We mustn't do this until we have</span></span>
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<pre style="margin: 0;">+<span id="LC351" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// pushed the free variables to the update remembered set above.</span></span>
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<pre style="margin: 0;">+<span id="LC352" class="line" lang="c"> <span class="n" style="color: #333;">OVERWRITING_CLOSURE_SIZE</span><span class="p">(</span><span class="n" style="color: #333;">bh</span><span class="p">,</span> <span class="n" style="color: #333;">closure_sizeW_</span><span class="p">(</span><span class="n" style="color: #333;">bh</span><span class="p">,</span> <span class="n" style="color: #333;">INFO_PTR_TO_STRUCT</span><span class="p">(</span><span class="n" style="color: #333;">bh_info</span><span class="p">)));</span></span>
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<pre style="margin: 0;">+<span id="LC353" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC354" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// The payload of the BLACKHOLE points to the TSO</span></span>
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<pre style="margin: 0;"> <span id="LC355" class="line" lang="c"> <span class="n" style="color: #333;">RELAXED_STORE</span><span class="p">(</span><span class="o" style="font-weight: 600;">&</span><span class="p">((</span><span class="n" style="color: #333;">StgInd</span> <span class="o" style="font-weight: 600;">*</span><span class="p">)</span><span class="n" style="color: #333;">bh</span><span class="p">)</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">indirectee</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">StgClosure</span> <span class="o" style="font-weight: 600;">*</span><span class="p">)</span><span class="n" style="color: #333;">tso</span><span class="p">);</span></span>
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<td class="diff-line-num new_line" data-linenumber="356" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
356
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<pre style="margin: 0;"> <span id="LC356" class="line" lang="c"> <span class="n" style="color: #333;">SET_INFO_RELEASE</span><span class="p">(</span><span class="n" style="color: #333;">bh</span><span class="p">,</span><span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">stg_BLACKHOLE_info</span><span class="p">);</span></span>
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